diff options
| -rw-r--r-- | drivers/misc/mei/pci-txe.c | 293 |
1 files changed, 293 insertions, 0 deletions
diff --git a/drivers/misc/mei/pci-txe.c b/drivers/misc/mei/pci-txe.c new file mode 100644 index 000000000000..af4412cf2456 --- /dev/null +++ b/drivers/misc/mei/pci-txe.c @@ -0,0 +1,293 @@ +/* + * + * Intel Management Engine Interface (Intel MEI) Linux driver + * Copyright (c) 2013-2014, Intel Corporation. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + */ + +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/device.h> +#include <linux/fs.h> +#include <linux/errno.h> +#include <linux/types.h> +#include <linux/pci.h> +#include <linux/init.h> +#include <linux/sched.h> +#include <linux/uuid.h> +#include <linux/jiffies.h> +#include <linux/interrupt.h> +#include <linux/workqueue.h> + +#include <linux/mei.h> + + +#include "mei_dev.h" +#include "hw-txe.h" + +static DEFINE_PCI_DEVICE_TABLE(mei_txe_pci_tbl) = { + {PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x0F18)}, /* Baytrail */ + {0, } +}; +MODULE_DEVICE_TABLE(pci, mei_txe_pci_tbl); + + +static void mei_txe_pci_iounmap(struct pci_dev *pdev, struct mei_txe_hw *hw) +{ + int i; + for (i = SEC_BAR; i < NUM_OF_MEM_BARS; i++) { + if (hw->mem_addr[i]) { + pci_iounmap(pdev, hw->mem_addr[i]); + hw->mem_addr[i] = NULL; + } + } +} +/** + * mei_probe - Device Initialization Routine + * + * @pdev: PCI device structure + * @ent: entry in mei_txe_pci_tbl + * + * returns 0 on success, <0 on failure. + */ +static int mei_txe_probe(struct pci_dev *pdev, const struct pci_device_id *ent) +{ + struct mei_device *dev; + struct mei_txe_hw *hw; + int err; + int i; + + /* enable pci dev */ + err = pci_enable_device(pdev); + if (err) { + dev_err(&pdev->dev, "failed to enable pci device.\n"); + goto end; + } + /* set PCI host mastering */ + pci_set_master(pdev); + /* pci request regions for mei driver */ + err = pci_request_regions(pdev, KBUILD_MODNAME); + if (err) { + dev_err(&pdev->dev, "failed to get pci regions.\n"); + goto disable_device; + } + + err = pci_set_dma_mask(pdev, DMA_BIT_MASK(36)); + if (err) { + err = pci_set_dma_mask(pdev, DMA_BIT_MASK(32)); + if (err) { + dev_err(&pdev->dev, "No suitable DMA available.\n"); + goto release_regions; + } + } + + /* allocates and initializes the mei dev structure */ + dev = mei_txe_dev_init(pdev); + if (!dev) { + err = -ENOMEM; + goto release_regions; + } + hw = to_txe_hw(dev); + + /* mapping IO device memory */ + for (i = SEC_BAR; i < NUM_OF_MEM_BARS; i++) { + hw->mem_addr[i] = pci_iomap(pdev, i, 0); + if (!hw->mem_addr[i]) { + dev_err(&pdev->dev, "mapping I/O device memory failure.\n"); + err = -ENOMEM; + goto free_device; + } + } + + + pci_enable_msi(pdev); + + /* clear spurious interrupts */ + mei_clear_interrupts(dev); + + /* request and enable interrupt */ + if (pci_dev_msi_enabled(pdev)) + err = request_threaded_irq(pdev->irq, + NULL, + mei_txe_irq_thread_handler, + IRQF_ONESHOT, KBUILD_MODNAME, dev); + else + err = request_threaded_irq(pdev->irq, + mei_txe_irq_quick_handler, + mei_txe_irq_thread_handler, + IRQF_SHARED, KBUILD_MODNAME, dev); + if (err) { + dev_err(&pdev->dev, "mei: request_threaded_irq failure. irq = %d\n", + pdev->irq); + goto free_device; + } + + if (mei_start(dev)) { + dev_err(&pdev->dev, "init hw failure.\n"); + err = -ENODEV; + goto release_irq; + } + + err = mei_register(dev); + if (err) + goto release_irq; + + pci_set_drvdata(pdev, dev); + + return 0; + +release_irq: + + mei_cancel_work(dev); + + /* disable interrupts */ + mei_disable_interrupts(dev); + + free_irq(pdev->irq, dev); + pci_disable_msi(pdev); + +free_device: + mei_txe_pci_iounmap(pdev, hw); + + kfree(dev); +release_regions: + pci_release_regions(pdev); +disable_device: + pci_disable_device(pdev); +end: + dev_err(&pdev->dev, "initialization failed.\n"); + return err; +} + +/** + * mei_remove - Device Removal Routine + * + * @pdev: PCI device structure + * + * mei_remove is called by the PCI subsystem to alert the driver + * that it should release a PCI device. + */ +static void mei_txe_remove(struct pci_dev *pdev) +{ + struct mei_device *dev; + struct mei_txe_hw *hw; + + dev = pci_get_drvdata(pdev); + if (!dev) { + dev_err(&pdev->dev, "mei: dev =NULL\n"); + return; + } + + hw = to_txe_hw(dev); + + mei_stop(dev); + + /* disable interrupts */ + mei_disable_interrupts(dev); + free_irq(pdev->irq, dev); + pci_disable_msi(pdev); + + pci_set_drvdata(pdev, NULL); + + mei_txe_pci_iounmap(pdev, hw); + + mei_deregister(dev); + + kfree(dev); + + pci_release_regions(pdev); + pci_disable_device(pdev); +} + + +#ifdef CONFIG_PM +static int mei_txe_pci_suspend(struct device *device) +{ + struct pci_dev *pdev = to_pci_dev(device); + struct mei_device *dev = pci_get_drvdata(pdev); + + if (!dev) + return -ENODEV; + + dev_dbg(&pdev->dev, "suspend\n"); + + mei_stop(dev); + + mei_disable_interrupts(dev); + + free_irq(pdev->irq, dev); + pci_disable_msi(pdev); + + return 0; +} + +static int mei_txe_pci_resume(struct device *device) +{ + struct pci_dev *pdev = to_pci_dev(device); + struct mei_device *dev; + int err; + + dev = pci_get_drvdata(pdev); + if (!dev) + return -ENODEV; + + pci_enable_msi(pdev); + + mei_clear_interrupts(dev); + + /* request and enable interrupt */ + if (pci_dev_msi_enabled(pdev)) + err = request_threaded_irq(pdev->irq, + NULL, + mei_txe_irq_thread_handler, + IRQF_ONESHOT, KBUILD_MODNAME, dev); + else + err = request_threaded_irq(pdev->irq, + mei_txe_irq_quick_handler, + mei_txe_irq_thread_handler, + IRQF_SHARED, KBUILD_MODNAME, dev); + if (err) { + dev_err(&pdev->dev, "request_threaded_irq failed: irq = %d.\n", + pdev->irq); + return err; + } + + err = mei_restart(dev); + + return err; +} + +static SIMPLE_DEV_PM_OPS(mei_txe_pm_ops, + mei_txe_pci_suspend, + mei_txe_pci_resume); + +#define MEI_TXE_PM_OPS (&mei_txe_pm_ops) +#else +#define MEI_TXE_PM_OPS NULL +#endif /* CONFIG_PM */ +/* + * PCI driver structure + */ +static struct pci_driver mei_txe_driver = { + .name = KBUILD_MODNAME, + .id_table = mei_txe_pci_tbl, + .probe = mei_txe_probe, + .remove = mei_txe_remove, + .shutdown = mei_txe_remove, + .driver.pm = MEI_TXE_PM_OPS, +}; + +module_pci_driver(mei_txe_driver); + +MODULE_AUTHOR("Intel Corporation"); +MODULE_DESCRIPTION("Intel(R) Trusted Execution Environment Interface"); +MODULE_LICENSE("GPL v2"); |